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I've done an internet search trying to find the theoretical maximum number of input datasets that the Merge tool will accept. Nothing has turned up. I'm currently using 10.5.1

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    Your merge isnt working or why does it matter? – BERA Dec 15 '17 at 18:47
  • idk, I just added ~150 feature classes in the merge gui and it worked. – atxgis Dec 15 '17 at 20:21
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Unless the Merge documentation specifies a limit, which it does not, I think you should assume that for practical purposes it is unlimited.

My recollection is that the MERGE command of ARC/INFO, from which this tool derives had a limit of 500 coverages, and so I would expect that you would be able to use at least that many feature classes.

If you encounter a limit when using this tool then I think you should revise your question with your evidence for that.

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